What are “bottom focus” and “top focus” variants?

The Line 6 Helix offers the ability to configure its ten primary footswitches in five ways:

Bank up/down + eight patch selectors

Bank up/down + four patch selectors on the bottom row and four FX on/off on the top row

Bank up/down + four patch selectors on the top row and four FX on/off on the bottom row

Bank up/down with eight FX on/off

Ten FX on/off (with no bank up/down)

A patch with “top focus” puts the most essential effects control on the top row while a patch with “bottom focus” puts the most essential effects control on the bottom row. In many cases using mode (4) above gives access to additional options. In some cases mode (5) may allow a few additional control options.